Peter, John and Mary intend to purchase 15, 16, 18 books and 9, 11, 15 pens each respectively. In shop A a book cost Kshs 250 and a pen costs Kshs 175 while in shop B, a book cost Ksh 225 while a pen costs Kshs 190.
i) Represent this information in matrix form.
ii) Using matrix method, determine the total cost the three students would spend to acquire the items from shop A and from shop B.
Answer:
i)
ii)
ii)
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Simplify the expression (A+B)(A+C) stating the law of Boolean algebra applied at each step 
